The governor of Missouri has ordered the withdrawal of National Guard troops from riot-torn Ferguson, Missouri.
Tensions in the town have eased after protests were staged nightly since police killed an unarmed black teenager.
Peaceful demonstrations overnight were the calmest street gatherings in the small St. Louis suburb since riots erupted over the August 9 shooting of 18-year-old Michael Brown by a white police officer.
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Mr Osborne said he is "not the person to provide the unity my party needs".